package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import net.sf.jsqlparser.expression.DateTimeLiteralExpression;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //select sum(amout) from orders where order_time >= beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add( turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }
    //用户统计

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add( begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放总用户数量 select count(id) from user where create_time < endTime
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
           LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
           LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
           Map map = new HashMap();
           map.put("end", endTime);
           //总用户数量
           Integer totalUser = userMapper.countByMap(map);

           map.put("begin", beginTime);
           //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
          //封装VO并返回
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    @Override
    //订单统计
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add( begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate localDate : dateList) {
            //查询每天的订单总数 select count(id) from orders where order_time < ? and order_time > ?
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数 select count(id) from orders where order_time < ? and order_time > ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区内的订单总数量
        //遍历集合，将集合中的数据累加到一起
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区内的有效的订单数量
        //遍历集合，将集合中的数据累加到一起
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    //销量排名top10
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");


        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /*
    * 导出运营数据报表
    * */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库获取营业数据 查询接近30天的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询概览的数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //通过POI将数据写入Excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于数据模板文件创建工作簿
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

            //获取第4行
            XSSFRow row = sheet.getRow(3);
            //填充数据
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获取第五行
            row = sheet.getRow(4);
            //填充数据
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业额数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获取单元格
                XSSFRow dataRow = sheet.getRow(7+i);
                dataRow.getCell(1).setCellValue(date.toString());
                dataRow.getCell(2).setCellValue(businessData.getTurnover());
                dataRow.getCell(3).setCellValue(businessData.getValidOrderCount());
                dataRow.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                dataRow.getCell(5).setCellValue(businessData.getUnitPrice());
                dataRow.getCell(6).setCellValue(businessData.getNewUsers());
            }



            //通过输出流将Execel文件输出到浏览器，提供下载
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭数据流
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     * 查询指定时间区间内订单数量
     *
     * @param begin
     * @param end
     * @param status
     * @return
     */
    public Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }
}
